Lavatory sink



FIG. 1 is a perspective view of lavatory sink according to the claimed design;

FIG. 2 is a top elevational view of the lavatory sink shown in FIG. 1;

FIG. 3 is a front elevational view of the lavatory sink shown in FIG. 1;

FIG. 4 is a side elevational view of the lavatory sink shown in FIG. 1 (each side of the lavatory sink being a mirror image of the other);

FIG. 5 is a rear elevational view of the lavatory sink shown in FIG. 1; and,

FIG. 6 is a bottom elevational view of the lavatory sink shown in FIG. 1. 

I claim the ornamental design for lavatory sink, as shown and described. 